Department of Horticulture, G.B. Pant University of Agriculture and Technology, Pantnagar 263 145
Root distribution pattern of 18 years old bearing trees of grapefruit cultivar New Zealand budded on trifoliate orange rootstock was studied by free monolith method of root excavation. The roots excavated from 3 radial distances i.e., 0–60, 60–120, 120–180 cm from tree trunk and 3 depths i.e., 0–20, 20–40, 40–60 cm from ground level indicate that the various categories of roots (fibrous, thin, medium and thick) and differed significantly at various radial distances and depths (except thin roots). The maximum amount of active (fibrous and thin) roots were found at 0–60 cm radial distance and at 0–20 cm depth.
